Migrate pippy examples over and run tests

[muellerzr]

What does this PR do?

Since pippy 0.2.0 is out, adds it as a test dep. Also migrates the examples from the example repo to Accelerate and updates the relevant docs.

Should be merged after #2423

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

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@SunMarc @kwen2501

[HuggingFaceDocBuilderDev]

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[SunMarc]

Thanks for adding the tests ! Just a few nits

[kwen2501]

Thanks much for preparing those examples!
Looks clean and nice!